The Original Prusa i3 MK3 is the successor of the award-winning Original Prusa i3 MK2 3D printer.

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XYZ Calibration fails before beginning.

Originally I was able to make it through the first process of xyz calibration, but as soon as it moved on to "improving accuracy" in the second step of xyz calibration, the extruder stabs a little hole in the paper and would catch so I slightly lowered the PINDA probe.

Then it wouldn't even start xyz calibration. The z-axis would raise completely, it would ask if the steel sheet was removed and if the nozzle was clean, then it would immediately fail the calibration before starting anything. I slightly tightened the trapezoidal screws on the z-axis, and now the printer asks if the steel sheet was removed, moves the z-axis downward and fails and soon as it brings the extruder to it's position close to the bed. I attached a link to a video to show the process.

I've updated the firmware as well. Thanks!

EDIT: Important note, I was able to make it past this step BEFORE I updated the firmware to the latest version.

https://drive.google.com/open?id=1F-TS_Q...

Answered! View the answer I have this problem too

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My video of the same exact series of events.

https://youtu.be/SZ3j8Nm4ips

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Chosen Solution

Hi,

guys I will discuss this with our FW developers. In the meantime can you please try our latest FW?

3.1.1-RC5: https://github.com/prusa3d/Prusa-Firmwar...

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RC5 works and calibrated for me! Thanks for the help! (:

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Great news Alex! Happy printing!

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Most Helpful Answer

@ajwilkie @samgrob @samgrob

Guys, I think I see the issue... your Extruders are assembled incorrectly. Look in the manual, the nozzle is slightly below the fan-nozzle, let's say few millimetres, but in both videos above I see the nozzle way lower than the fan-nozzle. Also, the PINDA probe is just a few threads below the edge of the holder, but in your case way lower.

You need to reseat the hotend inside the printed part extruder-body.

See your Extruder from below and compare it with this step: 5. E-axis assembly

The circular hotend part is aligned with the plastic part

Let me know ;)

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I reassembled my extruder and put some pictures up in another thread and that didn't fix the issue for me. It's now placed correctly a few mm below the plastic HOT! piece.

I'm still running on the first firmware fine though. I'll try the new one when I can and let you know!

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Alex, try the latest FW and let me know. In case it won't work, please take pictures/video of the entire printer, so I can check, whether there is some assembly issue or there is some faulty part ;)

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YES! This was it! Thank you sooo much! I was just off a bit when I installed the hot end. It fit, but was then too low. I readjusted and everything works great!

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Hey there!

So far I've fixed the issue by downgrading to the release firmware and was able to get everything running. I'll try upgrading the firmware to the new version and see what happens later today!

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Same problem here, immediate fail searching for point 1.

In addition there seems to be a difference in firmwares:

3.1.1 RC3 (as delivered) -> immediate fail

3.1.1 RC4 (tested) -> immediate fail

3.1.1 RC5 (tested) -> immediate fail

3.1.1 RC2 (tested) -> immediate fail

3.1.1 RC1 (tested) -> SUCCESS finding points 1,2,3 and 4

fails at refining point 1 - neverending loop

Obviously my PINDA is working fine, as it successfully found 4 points with RC1

How do I proceed please ?

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Hey Sam,

My calibration failed on RC1 calibration at first too. I don't know if it was a fluke, but I removed the paper for a bit and it worked on that attempt. No idea if that would affect anything.

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I did not all all the above iterations of firmware, but mine did the same with the original firmware and failed as I've described with the current.

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I just tried RC5 with my heatbed under 40 deg C and it still failed

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@ajwilkie @samgrob @samgrob

Guys, can you please run this (or confirm) it fails even if both hotend and heatbed temps are under 40° C?

Thank you

Jakub

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Yes, fails immediately. Hotend and Heatbed at room temp (24 C)

3.1.1 RC 5

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First, you were correct. Hotend was not seated correctly, now higher up in the holder. Guess this point could be stressed more in the assembly instructions. Now it looks like this:

Block Image

Second - we have A WINNER

XYZ Calibration finished fine (3.1.1 RC5 - hotend and bed below 40 C)

Block Image

Thanks for you help in this !

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Awesome! Glad I helped to solve it. Enjoy your printer ;)

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Alex Wilkie will be eternally grateful.
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